SKU: 6063878779

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8 (Replaces 3853850, 8M0113734)

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Description

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8 (Replaces 3853850, 8M0113734)Sea Water Pump Fits Volvo Penta, MerCruiser, OMC 4. 3L, 5. 0L, 5. 7L V6 V8 This marine water pump is a bi directional circulation pump designed for GM V6 V8 marine engines used in raw water cooling systems across multiple brands. It is a direct, engine mounted replacement for sterndrive and inboard applications. This pump fits a wide range of models, including Volvo Penta 4. 3L, 5. 0L, & 5. 7L engines (1973+); MerCruiser 4. 3L V6, 5. 0L & 5. 7L V8

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8

This marine water pump is a bi-directional circulation pump designed for GM V6/V8 marine engines used in raw water cooling systems across multiple brands. It is a direct, engine-mounted replacement for sterndrive and inboard applications.

This pump fits a wide range of models, including Volvo Penta 4.3L, 5.0L, & 5.7L engines (1973+); MerCruiser 4.3L V6, 5.0L & 5.7L V8 engines (1963–2014); and OMC V6/V8 engines (1968–1998). It also fits certain Indmar, Pleasurecraft, and Chrysler small block cooling systems.

  • Direct Replacement: Replaces OEM part numbers MerCruiser 8M0113734/3853850, Volvo Penta 3853850, OMC 3853850, and Sierra 18-3599-2.
  • Durable Construction: Features a steel housing with a stainless steel back plate and impeller cover for enhanced corrosion resistance.
  • Complete Kit: Includes the sea water pump assembly and a new gasket set for a complete installation.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
MerCruiser 8M0113734, 3853850
Volvo Penta 3853850
OMC 3853850
Sierra 18-3599-2

Compatible Engine Models

Confirm your engine model/year in the table below. For MerCruiser owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For all other makes, confirm your engine model/year in the tables below.

MerCruiser Applications

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L V6 140-200 HP 4-Stroke Up to 2007 8M0113734/3853850 Not applicable to 2008+ 4.3L engines
MerCruiser 5.0L V8 155-205 HP 4-Stroke All years 8M0113734/3853850
MerCruiser 5.7L V8 230-260 HP 4-Stroke All years 8M0113734/3853850
MerCruiser 6.2L V8 260+ HP 4-Stroke All years 8M0113734/3853850

Volvo Penta Applications

Brand Model Rated HP Stroke Years OEM Part No.
Volvo Penta 4.3GL, 4.3GXi 190-225 HP 4-Stroke 1973 and later 3853850
Volvo Penta 5.0GL, 5.0GXi 200+ HP 4-Stroke 1973 and later 3853850
Volvo Penta 5.7GL, 5.7GXi 250+ HP 4-Stroke 1973 and later 3853850

OMC Applications

Brand Model Rated HP Stroke Years OEM Part No.
OMC 4.3L V6 140-200 HP 4-Stroke 1968-1998 3853850
OMC 5.0L V8 155-205 HP 4-Stroke 1968-1998 3853850
OMC 5.7L V8 230-260 HP 4-Stroke 1968-1998 3853850

Indmar/Chrysler/Other Applications

Brand Model Rated HP Stroke
Indmar 4.3L, 5.0L, 5.7L 140-260 HP 4-Stroke
Chrysler 4.3L, 5.0L, 5.7L 140-260 HP 4-Stroke
Pleasurecraft Small Block V6/V8 140-260 HP 4-Stroke

Technical Specifications

Specification Value
Product Type Sea Water Circulation Pump
Installation Engine-mounted
Connection Brass fittings
Housing Material Steel with stainless steel back plate
Housing Color Black
Fitting Type Brass tubes
Warranty Lifetime (from certain sellers)
Other Technical Attributes Bi-directional design, stainless steel impeller cover

Package Contents

  • 1 x Sea Water Pump Assembly (Replaces 8M0113734/3853850)
  • 1 x Gasket Set (Replaces Sierra 18-0891)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any work.
  2. Drain Coolant: Place a catch pan under the engine and drain the raw water cooling system.
  3. Remove Hoses: Loosen the hose clamps and carefully detach the inlet and outlet hoses from the pump.
  4. Unbolt Old Pump: Remove the mounting bolts securing the old sea water pump to the engine block.
  5. Clean Surface: Thoroughly clean the engine mounting surface to remove any old gasket material or corrosion. A clean surface is crucial for a good seal.
  6. Position Gasket: Place the new gasket onto the cleaned mounting surface, aligning it with the bolt holes.
  7. Mount New Pump: Install the new sea water pump, ensuring it sits flush against the gasket. Hand-tighten the bolts first, then torque them to the manufacturer's specification.
  8. Reconnect Hoses: Reattach the raw water hoses to the new pump and securely tighten the clamps.
  9. Refill and Test: Reconnect the battery. Refill the cooling system with the appropriate coolant. Start the engine and carefully check for any leaks around the pump and hoses.

Troubleshooting & FAQ

Q: How do I confirm this pump fits my engine?
A: Start by checking the compatible engine model tables provided for MerCruiser, Volvo Penta, and OMC. This pump fits GM-based V6 and V8 marine engines and is a direct replacement for part numbers 8M0113734 and 3853850. Important: It is not compatible with MerCruiser 4.3L V6 engines from 2008 and newer.

Q: What are the signs my sea water pump is failing?
A: Common signs of a failing pump include the engine running hotter than normal or overheating, visible water leaks from the pump body or weep holes, a grinding or rattling noise coming from the pump assembly, or noticeably reduced water flow from the exhaust port.

Q: Is this pump bi-directional? What does that mean?
A: Yes, this pump features a bi-directional design. This means it can circulate water effectively regardless of the engine's rotational direction, making it compatible with both standard and reverse-rotation engines without modification.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 6063878779

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★★★★★ 5
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Color: Wild Spruce, Style: 1/2 inch
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Reviewed in the United States on May 9, 2026
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Mariia Vetchynova
New York, US
★★★★★ 4
Lightweight yoga mat
Color: Rose, Style: 1/2 inch
The yoga mat is not one of those heavy-duty ones. It’s quite light, but it tends to crease easily and takes a long time to return to its original shape after being rolled or folded.
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Reviewed in the United States on April 26, 2026
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Chica Chica Chickpea
Omaha, US
★★★★★ 5
Great Mat!
Color: Boysenberry, Style: 1/2 inch
I’ve been using this mat 4+ days a week for 2.5 months and it is durable and comfortable. I use it for yoga, sculpt, and Pilates. It’s held up during burpees, pushups, and plenty other moves that I half expected would tear the mat, but it’s held up great. It also gets wiped down with a disinfectant after each use. Still like new. Great price too!
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Reviewed in the United States on May 9, 2026
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Chelsea DiCicco
Los Angeles, US
★★★★★ 5
Comfortable material, perfect size, and matches the online images!
Color: Blue Mist, Style: 1/2 inch, Color: Blue Mist, Style: 1/2 inch
This Retrospec Solana Yoga Mat is super cushiony and soft, and perfect if you're looking for something with extra thickness. The size was just what I was looking for, and I'm looking forward to using it on my concrete back porch! Comfort level 5 out of 5! I really love the color quality of this, too. I've had several yoga mats in the past, and this one is one of the prettiest blues. The color quality was true to the product description and matched the online images. Unboxing: It was super easy to roll out, and the packaging kept it safe from any damage. Note: Upon opening it, it had that kind fo funky fresh-out-of-the-box smell, but it went away within just a few days.
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Reviewed in the United States on April 20, 2026
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Lowell, US
★★★★★ 5
Love it!!
Color: Rose, Style: 1/2 inch, Color: Rose, Style: 1/2 inch
i saw a lot of bad reviews after i had ordered this product so i was a little scared, but it did come with the strap to secure it which i love keeps it all rolled up together, it’s not slippery at all i also saw reviews about that the ribbed design is a bit different to my liking but it’s still very comfortable, it kind of reminds me of memory foam. The color is such a muted pink but so pretty and it’s very lightweight!! it’s definitely worth the money very good quality
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